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'[PIC:] MAX232 Capacitors???'
2004\04\27@133552 by Matt Redmond

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Hiya,

The Maxim datasheet says use 1.0uf external caps on their MAX232 part and use 0.1uf caps with their MAX232A part.

Everyone in the world seems to specify 10uf for the MAX232.

Any idea which is correct?

Thanks!

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2004\04\27@140307 by steve

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I use 1.0uf caps with the MAX232. I've built literally hundreds of them and
never run into problems even above 100k baud.


Quoting Matt Redmond <spam_OUTmdredmondTakeThisOuTspamCHARTER.NET>:

{Quote hidden}

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2004\04\27@142220 by Mark Jordan

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       This is the old case of the missing "point" ...  ;-))

       Mark Jordan

On 27 Apr 2004 at 17:33, Matt Redmond wrote:

{Quote hidden}

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2004\04\27@154413 by David Schmidt

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The 'A' version of the chip has a higher frequency osc and therefore can use
smaller caps , 0.1uf.
The non-'A' version of the chip needs 1uf minimum, but others recommed 10uF
since if gives the chip higher output current driving capability.

I've used 1uF on all my stuff for years without problems, though there was a
time I 'forgot' what value I was supposed to use, bought 1000 qty 10uF caps
and used those instead.

The 'A' part and the non-'A' part are NOT the same part!


Dave

----- Original Message -----
>The Maxim datasheet says use 1.0uf external caps on their MAX232 part and
use
> 0.1uf caps with their MAX232A part.

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2004\04\27@160903 by Wouter van Ooijen

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> The Maxim datasheet says use 1.0uf external caps on their
> MAX232 part and use 0.1uf caps with their MAX232A part.

I don't, I always use 1 uF. Smaller and cheaper.

> Everyone in the world seems to specify 10uf for the MAX232.

IIRC there is a load/voltage graph somewhere in the datasheet. You can
use it to determine what cap you need. I think even the vanilla MAX232
will work with 100nF under some circumstances.

Wouter van Ooijen

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2004\04\27@161529 by Igor Pokorny

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If you need to feed anything else from MAX232 chip you better use 10
uf... BTW I thought chips ending by 'E' are allowed to use 0.1 uf caps
only.

{Original Message removed}

2004\04\27@170342 by Peter Moreton

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I use MAX232CSE's (ie: ending in 'E') with 1uf cap's, and they work just
fine, even in noisy automotive environments.

> {Original Message removed}

2004\04\27@171417 by Michael J. Pawlowsky

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I use the .1uf on the 232A.
Although the 232A is a bit more expensive, the caps are cheaper and the price difference is neglible when you include the caps.

The 233 doesn't require any caps...  but the part is more expensive.
The choice factor for me is all in how many units you will produce.

Mike



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On 4/27/2004 at 5:33 PM Matt Redmond wrote:

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2004\04\27@211600 by Jonathan Johnson

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the 'E' is for extended ESD protection to 15KV I believe.

-----Original Message-----
From: pic microcontroller discussion list
[.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU]On Behalf Of Igor Pokorny
Sent: Wednesday, 28 April 2004 6:18 AM
To: PICLISTspamKILLspamMITVMA.MIT.EDU
Subject: Re: [PIC:] MAX232 Capacitors???


If you need to feed anything else from MAX232 chip you better use 10
uf... BTW I thought chips ending by 'E' are allowed to use 0.1 uf caps
only.

-----Original Message-----
From: pic microcontroller discussion list
[.....PICLISTKILLspamspam.....MITVMA.MIT.EDU] On Behalf Of Matt Redmond
Sent: Tuesday, April 27, 2004 7:34 PM
To: EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU
Subject: [PIC:] MAX232 Capacitors???


Hiya,

The Maxim datasheet says use 1.0uf external caps on their MAX232 part
and use 0.1uf caps with their MAX232A part.

Everyone in the world seems to specify 10uf for the MAX232.

Any idea which is correct?

Thanks!

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2004\04\27@220037 by Dave Tweed

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Matt Redmond <mdredmondspamspam_OUTCHARTER.NET> wrote:
> The Maxim datasheet says use 1.0uf external caps on their MAX232 part and
> use 0.1uf caps with their MAX232A part.
>
> Everyone in the world seems to specify 10uf for the MAX232.
>
> Any idea which is correct?

As always, it depends. For a discussion of some of the theory, see the
Circuit Cellar EQ for issue #156, in particular, problem #3:

  http://www.circuitcellar.com/library/eq/156/index.htm

-- Dave Tweed

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2004\04\27@222152 by Bob Axtell

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Be careful with the non-cap parts (Max233). I've seen heavy RF radiation
from the output pins, particularly if the device is not VERY heavily
bypassed. Can be a costly surprise.

--Bob

Michael J. Pawlowsky wrote:

> The 233 doesn't require any caps...  but the part is more expensive.
> The choice factor for me is all in how many units you will produce.


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'[PIC:] MAX232 Capacitors???'
2004\07\27@020413 by Duane Hofstetter
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I have been working on industrial single board computers and PLCs for the
last couple of years now and I can tell you most every MAX232 that I see has
10uf caps. I have even seen a mix of 15uf and 22uf caps being used..  They
do seem to work but they don't seem
to be following maxims suggestions..

----- Original Message -----
From: "Peter Moreton" <@spam@peterKILLspamspamRIL.ORG.UK>
To: <KILLspamPICLISTKILLspamspamMITVMA.MIT.EDU>
Sent: Tuesday, April 27, 2004 5:02 PM
Subject: Re: [PIC:] MAX232 Capacitors???


> I use MAX232CSE's (ie: ending in 'E') with 1uf cap's, and they work just
> fine, even in noisy automotive environments.
>
> > {Original Message removed}

2004\07\27@025151 by Peter Moreton

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I use Max232CSE's in a high volume design in a noisy automotive environment
with 1uf ceramic cap's, no problems at all. I think the data sheets mention
that you can increase the cap value quite a bit without ill effect.

Peter Moreton


> {Original Message removed}

2004\07\29@005313 by Steve Ruse

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I've built literally hundreds (maybe over a thousand?) of the MAX232 (not
232A) circuits using 1uF caps, and I don't have any problems. I've used
mostly the TI version, but I've also used Maxim and ? someone else's chip,
I'm drawing a blank now. The TI datasheet recommends 1uF caps, BTW.

Steve

{Original Message removed}

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